even as house speaker john boehner declares the negotiations are "going nowhere." >> brown: then, we turn to another congressional battle. kwame holman reports on sparring in the senate over proposals to change rules blamed for partisan gridlock. >> majority democrats want to put limits on the phil buster, a tactic used to delay legislation but republicans say the tool is key to protecting their minority rights. >> warner: on the eve of world aids day, ray suarez updates the hopes and frustrations in the fight against the deadly disease. >> brown: mark shields and david brooks analyze the weeks news. >> warner: and is the grand canyon 60 million years older than we've long thought? we ask science correspondent miles o'brien. >> brown: that's all ahead on tonight's newshour. >> major funding for the pbs newshour has been provided by: >> and by bnsf railway. and with the ongoing support of these institutions and foundations. and... this program was made possible by the corporation for public broadcasting. and by contributions to your pbs station from viewers like you. thank you. >> war